Bimetallic nanoalloy composite
A method of making a bimetallic nanoalloy composite includes mixing and dissolving a nickel salt, a cobalt salt, and an aromatic carboxylic acid in a first solvent to form a first mixture; mixing acetic acid with the first mixture and heating at a temperature of 150 to 200 degrees Celsius (° C.) form a second mixture; washing the second mixture with at least one organic solvent and drying to form a bimetallic metal-organic framework (CoNiBTC); heating the CoNiBTC at a temperature of 600 to 900° C. under a nitrogen stream to form a pyrolyzed composite; and cooling the pyrolyzed composite and exposing to a gas mixture to form the bimetallic nanoalloy composite. A method of making a benzimidazole compound. A method of making methane from CO 2 .
1 . A method of making a bimetallic nanoalloy composite, comprising:
mixing and dissolving a nickel salt, a cobalt salt and an aromatic carboxylic acid in a first solvent to form a first mixture;
mixing acetic acid with the first mixture and heating at a temperature of 150 to 200 degrees Celsius (° C.) form a second mixture;
washing the second mixture with at least one organic solvent and drying to form a bimetallic metal-organic framework (CoNiBTC);
heating the CoNiBTC at a temperature of 600 to 900° C. under a nitrogen stream to form a pyrolyzed composite;
cooling the pyrolyzed composite and exposing to a gas mixture to form the bimetallic nanoalloy composite, wherein the bimetallic nanoalloy composite is in the form of bimetallic nanoalloy composite particles comprising cobalt nanoparticles, nickel nanoparticles and porous carbon layers;
wherein the cobalt nanoparticles present in the bimetallic nanoalloy composite have an average particle size of 5 to 50 nanometers (nm);
wherein the nickel nanoparticles present in the bimetallic nanoalloy composite have an average particle size of 5 to 50 nm; and
wherein the nanoparticles of cobalt and nickel are embedded in the porous carbon layers of the bimetallic nanoalloy composite, and are uniformly distributed throughout the bimetallic nanoalloy composite.
2 . The method of claim 1 , wherein the cobalt nanoparticles are present in the bimetallic nanoalloy composite at a concentration of 20 to 50% by weight based on the total weight of the bimetallic nanoalloy composite.
3 . The method of claim 1 , wherein the nickel nanoparticles are present in the bimetallic nanoalloy composite at a concentration of 10 to 30% by weight based on the total weight of the bimetallic nanoalloy composite.
4 . The method of claim 1 , wherein the bimetallic nanoalloy composite is in the form of particles having a surface area of 150 to 210 square meters per gram (m 2 /g).
5 . The method of claim 1 , wherein the lattice structure of the bimetallic nanoalloy composite has an average interplanar spacing of 0.05 to 0.5 nm.
6 . The method of claim 1 , wherein the nickel salt comprises nickel sulfate, nickel acetate, nickel chloride, nickel nitrate, nickel carbonate, nickel phosphate and nickel oxalate, and/or a hydrate thereof.
7 . The method of claim 1 , wherein the cobalt salt comprises cobalt sulfate, cobalt acetate, cobalt citrate, cobalt iodide, cobalt chloride, cobalt perchlorate, cobalt nitrate, cobalt phosphate, cobalt triflate, cobalt bis(trifluoromethanesulfonyl)imide, cobalt tetrafluoroborate, cobalt bromide, and/or a hydrate thereof.
8 . The method of claim 1 , wherein the aromatic carboxylic acid comprises at least one of trimesic acid, trimellitic acid, trimellitic anhydride, and pyromellitic acid anhydride.
9 . The method of claim 1 , wherein the solvent is an amide solvent selected from the group consisting of N-methyl-2-pyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, and 1,3-dimethyl-2-imidazolidinone.
10 . The method of claim 1 , wherein a molar ratio of the nickel salt to the cobalt salt is in a range of 1:10 to 10:1, and wherein a molar ratio of the aromatic carboxylic acid to the combined amount of nickel and cobalt salt in the first mixture is in a range of 1:5 to 5:1.
11 . The method of claim 1 , wherein the bimetallic metal-organic framework (CoNiBTC) is in the form of particles having a surface area of 650 to 750 m 2 /g.
12 . The method of claim 1 , wherein the gas mixture comprises an oxygen gas and a nitrogen gas, and wherein a flow rate ratio of the oxygen gas to the nitrogen gas is in a range of 1:1 to 1:10.